Extraction of Thorium(Ⅳ), Lantanum(Ⅲ), and Yttrium(Ⅲ) Nitrates with a Composite Solid Extractant Based on a Polymeric Support Impregnated with Trialkylamine

摘要

Extraction of Th(Ⅳ), La(Ⅲ), and Y(Ⅲ) from aqueous solutions containing 0-4 M sodium nitrate with a composite solid extractant based on a polymeric support impregnated with trialkylamine (Alamine-336) was studied. The extraction isotherms were analyzed assuming that lanthanides and thorium are extracted with the solid extractant in the form of complexes (R_3HN)_3[Ln(NO_3)_5] and (R_3HN)_2[Th(NO_3)_6], respectively. The extraction constants were calculated. The joint extraction of Th(Ⅳ) and La(Ⅲ) [Y(Ⅲ)] with the solid extractant from aqueous salt solutions was studied.